The device address match feature is tailored for device filtering in Bluetooth Low Energy and similar implementations.
This feature enables on-the-fly device address matching while receiving a packet over-the-air. This feature only works in RX mode and when RADIO is configured for little endian, see PCNF1.ENDIAN for more information.
The device address match unit assumes that the first 48 bits of the payload are the device address and that bit number 6 in S0 is the TxAdd bit. See the Bluetooth Core Specification for more information about device addresses, TxAdd, and the device filtering procedure.
RADIO is able to listen for eight different device addresses at the same time. These addresses are specified in a DAB/DAP register pair, one pair per address, in addition to a TxAdd bit configured in the DACNF register. The DAB register specifies the 32 least significant bits of the device address, while the DAP register specifies the 16 most significant bits of the device address.
Each of the device addresses can be individually included or excluded from the matching mechanism. This is configured in the DACNF register.